#include<stdio.h>
#include<stdlib.h>
#include<string.h>
#include<unistd.h>
#include<arpa/inet.h>
#include<sys/socket.h>
#include<pthread.h>
#define BUF_SIZE 100
#define NAME_SIZE 20
void *send_msg(void *arg);
void *recv_msg(void *arg);
void error_handling(char *msg);

char name[NAME_SIZE]="[DEFAULT]";
char msg[BUF_SIZE];
int main(int argc,char *argv[])
{
	int sock;
	struct sockaddr_in serv_addr;
	pthread_t snd_thread,rcv_thread;
	void *thread_return;
	if(argc!=4)
	{
		printf("Usage:%s<IP><port><name>\n",argv[0]);
		exit(1);
	}
	
	sprintf(name,"[%s]",argv[3]);//将argv[3]赋值给name，按照第二个参数的形式
	sock=socket(PF_INET,SOCK_STREAM,0);

	memset(&serv_addr,0,sizeof(serv_addr));
	serv_addr.sin_family=AF_INET;
	serv_addr.sin_addr.s_addr=inet_addr(argv[1]);
	serv_addr.sin_port=htons(atoi(argv[2]));
	
	if(connect(sock,(struct sockaddr*)&serv_addr,sizeof(serv_addr))==-1)
		error_handling("connect() error");
	
	pthread_create(&snd_thread,NULL,send_msg,(void*)&sock);
	pthread_create(&rcv_thread,NULL,recv_msg,(void*)&sock);
	pthread_join(snd_thread,&thread_return);
	pthread_join(rcv_thread,&thread_return);
	close(sock);
	return 0;
}
void *send_msg(void *arg)//发送信息的线程
{
	int sock=*((int*)arg);
	char name_msg[NAME_SIZE+BUF_SIZE];
	while(1)
	{
		fgets(msg,BUF_SIZE,stdin);
		if(!strcmp(msg,"q\n")||!strcmp(msg,"Q\n"))
		{
			close(sock);
			exit(0);
		}
		sprintf(name_msg,"%s %s",name,msg);
		write(sock,name_msg,strlen(name_msg));
	}
	return NULL;
}
void *recv_msg(void *arg)//接收信息的线程
{
	int sock=*((int*)arg);
	char name_msg[NAME_SIZE+BUF_SIZE];
	int str_len;
	while(1)
	{
		str_len=read(sock,name_msg,NAME_SIZE+BUF_SIZE-1);
		if(str_len==-1)
			return (void*)-1;
		name_msg[str_len]=0;
		fputs(name_msg,stdout);
	}
	return NULL;
}
void error_handling(char *msg)
{
	fputs(msg,stderr);
	fputc('\n',stderr);
	exit(1);
}
